EP 0245397 B1 19900704 - A MAGNETIC SYSTEM
Title (en)
A MAGNETIC SYSTEM
Publication
Application
Priority
DK 531785 A 19851118
Abstract (en)
[origin: WO8703157A1] In an stereo pick-up having movable coils (14) and an SmCo magnet (22) with a high energy content, with the coil system (14, 15, 18) arranged in front of one pole face of said magnet, a yoke plate (23) of a magnetic soft material is arranged in front of said system to increase the magnetic induction in the coils. The great coercive force of the magnet is utilized for simplifying and reducing the costs of the mechanical structure in that the yoke plate is formed with two legs (26) which extend rearwardly, engage and are secured to two opposite sides of the magnet. The short-circuit of the magnet established by these legs has no noticeable impact on the induction in the air gap because of the high coercive force of the magnet. The manufacturing costs of the magnet system are additionally reduced in that, instead of a hole to receive a mounting assembly (16) for the coil system, the magnet, whose material is very hard, is formed in its underside with a slot (30) in whose bottom the mounting assembly is arranged and secured by means of a plate-shaped projection (31) on a casing member (32) of plastics.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
H04R 9/16 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
WO 8703157 A1 19870521; DK 155110 B 19890206; DK 155110 C 19890703; DK 531785 A 19870519; DK 531785 D0 19851118; EP 0245397 A1 19871119; EP 0245397 B1 19900704; JP S63501397 A 19880526; US 4884262 A 19891128
DOCDB simple family (application)
DK 8600127 W 19861118; DK 531785 A 19851118; EP 86906798 A 19861118; JP 50633386 A 19861118; US 7852487 A 19870717